eisemann



June 27, 1933. E. EISEMANN 1,915,655

MAGNETO ELECTRIC IGNITION DEVICE Filed Nov. 28, 1930 2 Sheets-Sheet 1 I ll- Junt 27, 1933.-

E. ElSEMA-NN MAGNETO ELECTRIC IGNITION DEVICE Filed Nov. 28, 1930 2 Sheets-Sheet 2 I If lfllfl io I ar/ll Patented June 27, 1933 UNITED STATES orrlca mar nrsanmr, or arurroaar, onmrrr,i'assrcnoa 'ronrsmrmn-wrzaxn AKTIENGESELLSCHAI'T, or srurrenar, enan'amr IAGNETO ELECTRIC IGNITION DEVICE Application fled Ioveinber 28, 1930, Serial 30.493315, and in: Germany December 3, 1929.

The invention relates to magneto ignition devices and more particularly to such asare adapted to be readily installed in known manner in the place of the head of battery ignition devices containing the interru ter and the distributor in order to replace attery ignition by magneto ignition.

The object is to make a ma eto ignition device which is as light and compact as possible and is suited to the shape and size of the head of the battery ignition device. Only multi-polar ignition devices are suitable for this pur ose because there is no transmission gear 1n them between the axles of the armature and the distributor, which would necessitate mutual displacement of the two axles in the usual simple constructions. Only those of the multi-polar ignition devices which are symmetrically disposed with regad to the armature axis can be used, again only because with them, a cylindrical shape similar to that of the distributor head of the battery ignition device is obtained without difiicu ty A construction has already been proposed for such a multi-polar ignition device adapted to be used instead of the distributor head of a battery ignition device in which construction a bell-shaped magnet having a wound yoke rotates between the pole shoes of a horseshoe-shaped armature. In this known apparatus the yoke and the main weight of the armature lies on the side turned away from the drive and owing to this the centre of gravit of the ignition device lies away from the aring axis of the apparatus. The shocks to which the apparatus is subjected have a very unfavourable action on the apparatus owing to this large moment about the centre of gravity.

According to this invention, a magneto ignition device is used, the centre of gravity of which lies somewhere in the axis of rotation of the armature and in the longitudinal direction of the same, but not over that end of the armature which is turned away from the driving side of the ignition device. A

magneto ignition device is preferably used in which a magnet ring which consists of a series of pole shoes uniformly distributed on the. same circle and rod' magnets inserted between these, ISdiSPOSed in known manner on the-armature which-is formed from two opposite portions of a sleeve'having alternately engaging lugs and a core lying in the 8X15 of rotation.-

The invention is more particularly descr bed with reference to the accompanying drawings in which Figure 1 is a cross-section through an igni- 6 t1on device on the line C-C of Fig. 2.

-Figure 2 i-s a section on the line AA of Fig. 1.

igures 3 and 4 are perspective views of 1the two portions of the sleeve of the arma- 65 ure.

Figures 5 and 6 show piecesof metal from which the parts of the sleeve are composed.

Figure 7 is a plan view of the end plates for the sleeve portions.

Figure 8 is a section through an end plate on the line B-B of Fig. 7.

Figure 9 shows the installation of an ignition device in a-lighting dynamo.

The trapczial magnets 2 which are preferably ofcobalt steel are mounted between the pole shoes 1 which are composed of pieces of sheet'metal stamped at one end in the form of a swallows tail. The pole shoes are held together by nuts and bolts 3 and at the desired distance from each other by non-magnetic end rings 4. The armature is formed from the two parts 5 and 6 which are so inserted in each other that one arm of each part lies between two arms of the other part and 35 the core 7 of the part 6 lies on the inner side ofthe yoke of the part 5. The parts 5 and 6 are composed of pieces of sheet metal stam ed in U or E shapes which are bent round the line a-a or bb by a predetermined angle according to the number of poles required, these parts 5 and 6 being also held together byrivets. In Figs. 4 and 5 the pieces of stamped metal are shown before being bent. The coil 8 of the ignition apparatus is mounted about the core 7. As shown in the drawings, each of the magnetic sleeve elements 5 and 6 is formed of an end spider and having parallel polar extensions carried at the ends; of the spider arms and lying in a cylindrical surface concentric with the axis of the sleeve. The entire armature unit is held to ether by two end plates 9 whichare pushe ,over thearmature consistingof the two parts 5' 5 and 6'in such a way that the yoke of one part is accommodated in the recess and the end of the arms of the other part are accommodated in the recesses 11. The end plates 9 hold the parts of the armature together by 10 screw pins 12. A cam shaft having the cams 16 is secured to the upper end plate 9.

The distributor disc 18 is mounted on a free end of theshaft 17 projecting beyond the cam 16. The interrupter casing 19 is en- 15 larged at its lower end substantially in the shape of a bell, to cover the ignition device, and is carried by the pins 3 of the ignition device. The distributor cover 20 is mounted on this casing in the usual manner.

20 The driving shaft 21, the free end of which is provided with a gear wheel. 22 which meshes with a worm wheel 23 of a dynamo 24 is accommodated in the lower end plate 9 of. the ignition device. The pins 3 of the ignition 25 device by which the frame of'the magneto of the ignition device is maintained in position are screwed into the parts 25 rigidly connected to the dynamo.

I claim:

1. A magneto electric ignition device comprising, in combination, a stator and a rotor mounted for rotation about a vertical axis.

said stator comprising a plurality of pole" shoes symmetrically arranged around said rotor, and bar magnets inserted between said pole shoes, said rotor comprising two magnetic sleeve elements with alternately-engaging pole extensions, a central core connecting said elements, and a coil surrounding said central core, and means for mounting said device upon adistributor head supporting base.

2. A magneto electric ignition device comprising in combination, a rotor comprising two magnetic sleeve elements each formed of an end spider, the arms of which are provided with polar extensions lying in a cylindrical surface concentric with the rotor axis, sa d magnet c sleeve elements being arranged with their polar extensions interleaved, and one of said sleeve elements being provided w th a central core concentric with the rotor ax s and engaging the inner face of the spider portion of said other sleeve element. and a roilwound around said central core, a stator comprising a plurality of pole shoes sym-.

metrically arranged around said rotor, and bar magnets inserted between said pole shoes, 3. An armature structure for a magneto electric ignition device com risin two magnetic sleeve elements each orme of an end spider, the arms of which are provided with polar extensions symmetrically arranged'in a circle concentric with the armature axis,

said magnetic sleeve elements being arranged with their polar extensions interleaved, a

central core arranged between the central polar extensions symmetrically arranged in a circle concentric with the armature axis, said magnetic sleeve elements being arranged with their polar extensions interleaved, a central .core arranged between the central portions of the end spiders of said sleeve elements, a air of spaced end plates each provided wit an axle extension on one side and with recesses on the other side for receiving the end spider of one sleeve and the ends of the polar extensions on the other sleeve, clamping rods arranged between said olar extensions and extending between sai end plates for clamping said sleeves between said plates, and a coil wound around said central core.

5. A magnetic structure for the rotor of a magneto electric ignition device comprising, two magnetic sleeve elements each including an end spider and polar extensions on the arms thereof, one of said magnetic sleeve elements being formed of.,a laminated structure comprising a plurality of U-shaped slam ed metal laminations bent about a symmetr cal axis so that the arm and the yoke portion lying on opposite sides of said axis lie in adjacent spider arms and olar extensions of said sleeve, and anot er of-said sleeve elements being formed of a plurality of E-shaped laminations bent about a symmetrical axis in a like manner, whereby said sleeve is provided with a central core memher, said sleeve members being arranged with their polar extenslons interleaved and with the free end of said magnetic core engaging the inner face of the end spider of said other sleeve.

In testimony whereof I have hereunto 

